Tag Archives: galaxies

Question: If the universe is expanding and all galaxies are moving away from each other, how is it possible that the Andromeda and milky way galaxies are on a collision course? – Johnny Answer: It is correct that on the … Continue reading →

Question: I’ve been looking at information about the largest known galaxy, IC 1101. Most sources say it is ~6 million light years in diameter but I can’t find any primary sources for this size estimate. I was looking through research … Continue reading →

Question: Some years ago I read an article that said (if I recall correctly) that there were quasars that seemed to be associated with galaxies (maybe in the center), but the quasar’s much larger red shifts implied that their distance … Continue reading →

Question: We know that stars and galaxies we see are just fossil light as they were millions or billions of years ago. Is it possible to extrapolate the changes that we see today in those galaxies to determine their current … Continue reading →

Question: Thank you for helping so many people. Is there an educated guess by professionals about the difference between what the universe is expanding into and the universe itself? – Jay Answer: This is going to sound very paradoxical, but … Continue reading →

Question: What if a galaxy only has 1 sun and 1 planet an it is in the exact middle? – Lance Answer: Galaxies are defined as collections of stars (possibly with planets), gas, and dust. A single sun with a … Continue reading →

Question: As per definition, Gravitational lensing refers to bending of light rays from a distant source around a massive object (Galaxy cluster) which tends to magnify the background light source. If visible light rays bend around those massive objects then … Continue reading →

Question: I’m embarrassed to ask this, as I feel after working here for so long I should already know the answer. But here it is: What are the top 3 discoveries/achievements of the VLA? And why? — Doug Answer: As … Continue reading →

Question: I have been hearing lately in some space documentaries that black energy, which makes the universe expand and at an increasing speed, separate and repulse objects such as galaxies from one another, am I correct? But i also heard … Continue reading →

Question: How can Hubble give pictures with different zoom levels? If telescopes are constructed with a fixed focal length and cannot “zoom”. How come that Hubble can see individual stars in the Andromeda Galaxy http://www.spacetelescope.org/images/heic1112a/. But can also see the … Continue reading →